Replica Vol.1 (2011)

Manji, a bodyguard for hire known as "Akainu (Red Dog)", is hunting a job when he meets Karu who works for "CARDS". When he discovers that Karu's mission is to exterminate the deadly "TOYs", mindless dolls that attack any living thing, Manji can't help but butt in and tag along to relieve his boredom...